kindl



Aug. 9. 1927.

' 1,638,266 C. H. KINDL IGNITION SYSTEM Filed Dec. '7. 1925 4 mm MPatented Aug. 9, 1927.

UNITED STATES PATENT OFFICE;

CARL I-I. KINDL, OF ANDERSON, INDIANA, ASSIGNOR, BY MESNE'ASSIGNMENTSTTO DELCO-REMY CORPORATION, OF DAYTON, OHIO, A CORPORATION OF DELAWARE.

IGNITION SYSTEM.

Application filed December 7, 1925. Serial No. 73,716.

This invention relates to ignition appara tus for interntil-combustionengines and particularly for high-speed engines having a large number ofcylinders and, therefore, re-,

quiring sparking impulses to be provided in rapid succession.

More particularly, the present invention relates to the type of ignitionapparatus disclosed in a patentto J. H. Hunt, No. 1,557; 201, issuedOctober 13, 1925. This patent discloses an ignition coil havingasecondary coil and two primary coils which are inductively related. Theignition timing, mechanism operates first to connect a current sourcewith one of the primary coils having a relatively low inductance.Current builds up rapidly in this primary coil in order to produce therequired magneto-motive force, following which both primary coils areconnected in series with the current source in order to reduce theamount of current to be carried by the timer contacts at the time ofbreak ofthe primary ignition circuit while maintaining the requiredmagneto-motive force. I

One of the objects of the present invention is to produce satisfactoryignition with apparatus which is less expensive to construct than thatdisclosed in the Hunt patent referred to. As in the Hunt patent thepresent invention provides for the rapid accumulation of magneto-motiveforce and for the reduction of primary current at the time of finalbreak of the primary circuit so that the current carried by the timercontacts at the time of separation will be within safe limits.

In order to accomplish these results by apparatus which can beconstructed at lower cost than the Hunt apparatus, the present inventionprovides an ignition coil including primary and secondary windings andan auxiliary coil of relatively low inductance, non-inductively relatedto the main ignition coil. The ignition timer is so constructed that theauxiliary coil only is connected with the current source in order thatit will be quickly energized. Then the auxiliary coil is connected inseries with the primary of the main ignition coil and the current sourcein order that the energy stored in the auxiliary coil will bedischargedinto the primary circuit of the ignition coil in order toboost the current in the ignition primary to a higher value than couldbe reached in the samelength of time if the auxiliary coil were notused. At the time of separation of the timer cont-acts to interrupt theflow of current to the main ignition coil, the primary current has beenreduced to a value which -the contacts can withstand without rapiddeterioration. Since the auxiliary coil is non-inductively related tothe main ignition coil, the secondary of the main ignition coll may havefewer turns than the secondary of the Hunt ignition apparatus.

One of the objects of the present invention is to provide an improvedform of in duction apparatus which can be charged rapidly with amagneto-motive force sufficient for providing a sparking impulse.

The ignition system includes induction apparatus comprising two primaryinductive circuits connected with the battery,.orother source ofcurrent, by a suitable enginedriven timing apparatus. A secondarywinding is inductively related to only one of the primary inductivecircuits and is connected with a distributor. The primary inductivecircuit, having no secondary winding, is energized before energizing theother primary inductive circuit; and,before said other circuit is discharged, the energy offthe first primary circuit is discharged intothe second primary circuit in order to boost the current in said secondcircuit to a higher value than could be reached in the same length oftime if the first primary circuit were not used.

Further objects and advantages of the present invention will be apparentfrom the following description. reference being had to the accompanying,drawings, wherein a preferred form of the present invention is clearlyshown.

In the drawings: v

Fig. 1 is a wiring diagram illustrating the present invention.

F i 's. 2 and 3 are diagrammatic views showlng developments of the timercams which are shown in Fig. 1.

Referring to Fig. 1, designates a storage battery grounded at 21 andconnected by switch 22 with a first primary inductive circuit 23 whichis connected by a wire 24 with a second primary inductive circuit 25.l/Vinding 25 is inductively related to a secondary winding 26 having oneend grounded on the primary circuit and the other end connected by wire27 with a distributor 28, for distributing sparking impulses to variousspark plugs, represented by the spark gaps 29. The wire 24: is connectedby wire with ignition timer contacts 31and 32, the latter being mountedon abreaker lever which is intermittently operated by an engine-drivencam 34. The breaker lever is grounded at 35 to complete the primarycircuit to the battery. The winding 25 is connected by wire withcontacts 37 and 38, the latter being mounted on breaker lever 39 whichis intermittently operated by an engine-driven cam 10. Springs 41yieldingly urge the breaker levers toward their respective cams, so thatthe pairs of contacts will remain in engagement until the rubbing blocks4:2 01 the levers are engaged by the lobes of the cams.

The cams 34; and rotate in the same direction and at the same rate,thedirection being clockwise in Fig. 1, or in the direction of the arrows45 in Figs. 2 and 3.

The operation of the invention is as follows: r I I Contacts 31 and 32are closedwhile the contacts 37 and 38 are open. This causes current toflow from the battery only through the first inductive circuit Thiscircuit is relatively low in inductance, so that a relative large amountof magnetometive force will be stored in the circuit Within a relativelybrief period. Then, after contacts 37 and 38close, contacts 31 and '32are opened, in order that the energy produced'in circuit 23 will bedischarged into the circuit'25, so that before. circuit 25 is dischargedthe current passing therethrough will reach a higher value'than would bepos sible if the circuit 23 were not used.

While the form of embodiment of the in vention as herein disclosed,constitutes a pre ferred form, it is to be understood thatother formsmight be adopted, all coming within the scope of the claims which011O7.'

lVhat is claimed is as follows:

1. An ignition system comprising an 'ig nition coil having a primary anda second ary inductively related, an auxiliary coil non-inductivelyrelated to the ignition coil, a source ci -current, and means forconnecting the auxiliary coil only with the current source, then forconnecting theauxiliary coil and primary .winding oi" the ignition coilin series with the current. source without disconnecting the auxiliarycoil, and then for disconnecting both coils from the current source.

2. An ignition system as defined by claim' '1 in which the riinar windinoi the ignition coil and the auxiliary coil have relatively lowinductance.

In testimony whereof I hereto afiix'iny signature.

' CARL H. KINDL.

Therefore satisfactory ignition can i

